Add optional recipient field for intent outputs

[Asem-Abdelhady]

Linear: https://linear.app/lifi-linear/issue/V2-116/add-recipient-field-on-lintentorg

Summary

• Adds an optional recipient field to global store (state.svelte.ts)
• Surfaces a Recipient address input in the IssueIntent screen (accepts any EVM address, validates on-the-fly)
• Threads outputRecipient through intentFactory.ts to toCoreCreateIntentOptions for both compact and escrow paths

Notes

• Stacked on asem/V2-109/accommodate-intent.ts-solana-changes
• Field is optional — leaving it blank uses the default recipient behaviour from the intent library

Test plan

• Open IssueIntent screen, verify Recipient input appears under the Verifier controls
• Enter an invalid string — confirm the field turns red (error state)
• Enter a valid EVM address — confirm error state clears
• Submit an intent with a custom recipient and verify the order's output recipient reflects the input address

Expected output

Screen.Recording.2026-04-07.at.1.15.16.PM.mov